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September 18, 2014

September 18, 2014

Posted by **Mimi** on Wednesday, February 25, 2009 at 12:41am.

cotx secx sinx=1

- College Algebra -
**drwls**, Wednesday, February 25, 2009 at 2:10amWrite cot and sec in terms of sin and cos, multiply it all together and watch everything cancel.

In case you forgot:

cot = cos/sin

sec = 1/cos

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